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12.1: Critical Values for t-Interval

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    16381
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    Degrees of Freedom (df) 80% 90% 95% 98% 99%
    1 3.078 6.314 12.706 31.821 63.657
    2 1.886 2.920 4.303 6.965 9.925
    3 1.638 2.353 3.182 4.541 5.841
    4 1.533 2.132 2.776 3.747 4.604
    5 1.476 2.015 2.571 3.365 4.032
    6 1.440 1.943 2.447 3.143 3.707
    7 1.415 1.895 2.365 2.998 3.499
    8 1.397 1.860 2.306 2.896 3.355
    9 1.383 1.833 2.262 2.821 3.250
    10 1.372 1.812 2.228 2.764 3.169
    11 1.363 1.796 2.201 2.718 3.106
    12 1.356 1.782 2.179 2.681 3.055
    13 1.350 1.771 2.160 2.650 3.012
    14 1.345 .1761 2.145 2.624 2.977
    15 1.341 1.753 2.131 2.602 2.947
    16 1.337 1.746 2.120 2.583 2.921
    17 1.333 1.740 2.110 2.567 2.898
    18 1.330 1.734 2.101 2.552 2.878
    19 1.328 1.729 2.093 2.539 2.861
    20 1.325 1.725 2.086 2.528 2.845
    21 1.323 1.721 2.080 2.518 2.831
    22 1.321 1.717 2.074 2.508 2.819
    23 1.319 1.714 2.069 2.500 2.807
    24 1.318 1.711 2.064 2.492 2.797
    25 1.316 1.708 2.060 2.485 2.787
    26 1.315 1.706 2.056 2.479 2.779
    27 1.314 1.703 2.052 2.473 2.771
    28 1.313 1.701 2.048 2.467 2.763
    29 1.311 1.699 2.045 2.462 2.756
    30 1.310 1.697 2.042 2.457 2.750
    31 1.309 1.696 2.040 2.453 2.744
    32 1.309 1.694 2.037 2.449 2.738
    33 1.308 1.692 2.035 2.445 2.733
    34 1.307 1.691 2.032 2.441 2.728
    35 1.306 1.690 2.030 2.438 2.724
    36 1.306 1.688 2.028 2.434 2.719
    37 1.305 1.687 2.026 2.431 2.715
    38 1.304 1.686 2.024 2.429 2.712
    39 1.304 1.685 2.023 2.426 2.712
    40 1.303 1.684 2.021 2.423 2.704
    41 1.303 1.683 2.020 2.421 2.701
    42 1.302 1.682 2.018 2.418 2.698
    43 1.302 1.681 2.017 2.416 2.695
    44 1.301 1.680 2.015 2.414 2.692
    45 1.301 1.679 2.014 2.412 2.690
    46 1.300 1.679 2.013 2.410 2.687
    47 1.300 1.678 2.012 2.408 2.685
    48 1.299 1.677 2.011 2.407 2.682
    49 1.299 1.677 2.010 2.405 2.680
    50 1.299 1.676 2.009 2.403 2.678
    51 1.298 1.675 2.008 2.402 2.676
    52 1.298 1.675 2.007 2.400 2.674
    53 1.298 1.674 2.006 2.399 2.672
    54 1.297 1.674 2.005 2.397 2.670
    55 1.297 1.673 2.004 2.396 2.668
    56 1.297 1.673 2.003 2.395 2.667
    57 1.297 1.672 2.002 2.394 2.665
    58 1.296 1.672 2.002 2.392 2.663
    59 1.296 1.671 2.001 2.391 2.662
    60 1.296 1.671 2.000 2.390 2.660
    61 1.296 1.670 2.000 2.389 2.659
    62 1.295 1.670 1.999 2.388 2.657
    63 1.295 1.669 1.998 2.387 2.656
    64 1.295 1.669 1.998 2.386 2.655
    65 1.295 1.669 1.997 2.385 2.654
    66 1.295 1.668 1.997 2.384 2.652
    67 1.294 1.668 1.996 2.383 2.651
    68 1.294 1.668 1.995 2.382 2.650
    69 1.294 1.667 1.995 2.382 2.649
    70 1.294 1.667 1.994 2.381 2.648
    71 1.294 1.667 1.994 2.380 2.647
    72 1.293 1.666 1.993 2.379 2.646
    73 1.293 1.666 1.993 2.379 2.645
    74 1.293 1.666 1.993 2.378 2.644
    75 1.293 1.665 1.992 2.377 2.643
    76 1.293 1.665 1.992 2.376 2.642
    77 1.293 1.665 1.991 2.376 2.641
    78 1.292 1.665 1.991 2.375 2.640
    79 1.292 1.664 1.990 2.374 2.640
    80 1.292 1.664 1.990 2.374 2.639
    81 1.292 1.664 1.990 2.373 2.638
    82 1.292 1.664 1.989 2.373 2.637
    83 1.292 1.663 1.989 2.372 2.636
    84 1.292 1.663 1.989 2.372 2.636
    85 1.292 1.663 1.988 2.371 2.635
    86 1.291 1.663 1.988 2.370 2.634
    87 1.291 1.663 1.988 2.370 2.634
    88 1.291 1.662 1.987 2.369 2.633
    89 1.291 1.662 1.987 2.369 2.632
    90 1.291 1.662 1.987 2.368 2.632
    91 1.291 1.662 1.986 2.368 2.631
    92 1.291 1.662 1.986 2.368 2.630
    93 1.291 1.661 1.986 2.367 2.630
    94 1.291 1.661 1.986 2.367 2.629
    95 1.291 1.661 1.985 2.366 2.629
    96 1.290 1.661 1.985 2.366 2.628
    97 1.290 1.661 1.985 2.365 2.627
    98 1.290 1.661 1.984 2.365 2.627
    99 1.290 1.660 1.984 2.365 2.626
    100 1.290 1.660 1.984 2.364 2.626
    101 1.290 1.660 1.984 2.364 2.625
    102 1.290 1.660 1.983 2.363 2.625
    103 1.290 1.660 1.983 2.363 2.624
    104 1.290 1.660 1.983 2.363 2.624
    105 1.290 1.659 1.983 2.362 2.623
    Table A.2: Critical Values for t-Interval

    This page titled 12.1: Critical Values for t-Interval is shared under a CC BY-SA 4.0 license and was authored, remixed, and/or curated by Kathryn Kozak via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.